Mitigation of anomalous propagation effects in radar

A Radar system, comprising an anomalous propagation processing unit, the anomalous propagation processing unit comprising:

• a pulse comparator unit operable to receive a plurality of returns from a Radar receiver and to compare a magnitude of each of the plurality of returns with its successor, and to determine if there is a first step change above a first predetermined threshold;
• a pulse magnitude unit operable to calculate a first average magnitude of returns following the first step change;
• a pulse phase unit operable to determine a trend in the phase values of returns following the first step change;
• and
• a pulse synthesis unit operable to synthesize returns before the first step change, using the calculated average magnitude and phase values according to the determined trend.

A non-transitory computer-readable storage medium having instructions encoded thereon which, when executed by one or more processors, cause a process to be carried out for mitigating the effects of anomalous propagation in a Radar system, the process comprising:

• receiving a plurality of returns from a plurality of transmit pulses;
• calculating a difference in magnitude between each of the plurality of returns and its successor;
• and
• if one of the calculated differences indicates a first step change greater than a first predetermined threshold, calculating a first average magnitude of the returns received after the first step change, and replacing the returns received before the first step change with synthesized returns having a magnitude equal to the first calculated average magnitude.